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Preview questions
1. What is soil primarily composed of?
Water and air · Mineral particles, organic matter, water, and air · Only mineral particles · Only organic matter
2. Which layer of soil is rich in humus?
Topsoil · Subsoil · Bedrock · Clay
3. What is the process of soil formation called?
Weathering · Erosion · Sedimentation · Decomposition
4. Which type of soil is best for growing crops?
Sandy soil · Clayey soil · Loamy soil · Saline soil
5. What is the main component of organic matter in soil?
Minerals · Water · Decayed plants and animals · Sand
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